/*
 *  Copyright 2008 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.mybatis.generator.codegen.ibatis2.sqlmap.elements;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.mybatis.generator.api.IntrospectedColumn;
import org.mybatis.generator.api.dom.OutputUtilities;
import org.mybatis.generator.api.dom.java.FullyQualifiedJavaType;
import org.mybatis.generator.api.dom.xml.Attribute;
import org.mybatis.generator.api.dom.xml.TextElement;
import org.mybatis.generator.api.dom.xml.XmlElement;
import org.mybatis.generator.codegen.ibatis2.Ibatis2FormattingUtilities;
import org.mybatis.generator.config.GeneratedKey;

/**
 * 
 * @author Jeff Butler
 * 
 */
public class InsertElementGenerator extends AbstractXmlElementGenerator {

	public InsertElementGenerator() {
		super();
	}

	@Override
	public void addElements(XmlElement parentElement) {
		XmlElement answer = new XmlElement("insert"); //$NON-NLS-1$

		answer.addAttribute(new Attribute("id", introspectedTable.getInsertStatementId())); //$NON-NLS-1$

		FullyQualifiedJavaType parameterType = introspectedTable.getRules().calculateAllFieldsClass();

		answer.addAttribute(new Attribute("parameterClass", //$NON-NLS-1$
				parameterType.getFullyQualifiedName()));

		context.getCommentGenerator().addComment(answer);

		GeneratedKey gk = introspectedTable.getGeneratedKey();

		if (gk != null && gk.isPlacedBeforeInsertInIbatis2()) {
			IntrospectedColumn introspectedColumn = introspectedTable.getColumn(gk.getColumn());
			// if the column is null, then it's a configuration error. The
			// warning has already been reported
			if (introspectedColumn != null) {
				// pre-generated key
				answer.addElement(getSelectKey(introspectedColumn, gk));
			}
		}

		StringBuilder insertClause = new StringBuilder();
		StringBuilder valuesClause = new StringBuilder();

		insertClause.append("insert into "); //$NON-NLS-1$
		insertClause.append(introspectedTable.getFullyQualifiedTableNameAtRuntime());
		insertClause.append(" ("); //$NON-NLS-1$

		valuesClause.append("values ("); //$NON-NLS-1$

		List<String> valuesClauses = new ArrayList<String>();
		Iterator<IntrospectedColumn> iter = introspectedTable.getAllColumns().iterator();
		while (iter.hasNext()) {
			IntrospectedColumn introspectedColumn = iter.next();
			if (introspectedColumn.isIdentity()) {
				// cannot set values on identity fields
				continue;
			}

			insertClause.append(Ibatis2FormattingUtilities.getEscapedColumnName(introspectedColumn));
			valuesClause.append(Ibatis2FormattingUtilities.getParameterClause(introspectedColumn));
			if (iter.hasNext()) {
				insertClause.append(", "); //$NON-NLS-1$
				valuesClause.append(", "); //$NON-NLS-1$
			}

			if (valuesClause.length() > 80) {
				answer.addElement(new TextElement(insertClause.toString()));
				insertClause.setLength(0);
				OutputUtilities.xmlIndent(insertClause, 1);

				valuesClauses.add(valuesClause.toString());
				valuesClause.setLength(0);
				OutputUtilities.xmlIndent(valuesClause, 1);
			}
		}

		insertClause.append(')');
		answer.addElement(new TextElement(insertClause.toString()));

		valuesClause.append(')');
		valuesClauses.add(valuesClause.toString());

		for (String clause : valuesClauses) {
			answer.addElement(new TextElement(clause));
		}

		if (gk != null && !gk.isPlacedBeforeInsertInIbatis2()) {
			IntrospectedColumn introspectedColumn = introspectedTable.getColumn(gk.getColumn());
			// if the column is null, then it's a configuration error. The
			// warning has already been reported
			if (introspectedColumn != null) {
				// pre-generated key
				answer.addElement(getSelectKey(introspectedColumn, gk));
			}
		}

		if (context.getPlugins().sqlMapInsertElementGenerated(answer, introspectedTable)) {
			parentElement.addElement(answer);
		}
	}
}
